mockery

(noun): The action of mocking; ridicule, derision.
(noun): Something so lacking in necessary qualities as to inspire ridicule; a laughing-stock.
(noun): Something insultingly imitative; an offensively futile action, gesture etc.
(noun): Mimicry, imitation, now usually in a derogatory sense; a travesty, a ridiculous simulacrum.

The defendant wasn't allowed to speak at his own trial - it was a mockery of justice.